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Author Topic: 92 2.5 to a 80 CJ with a 2.5  (Read 2067 times)

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Offline Jeffy

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Re: 92 2.5 to a 80 CJ with a 2.5
« Reply #15 on: January 23, 2009, 10:52:37 AM »
Quote from: Bounty Hunter on January 23, 2009, 12:18:45 AM
For some reason unbeknown to me, the MPFI computers need the VSS input or it will run poorly.  It will run, but won't idle well.  I ran without a speedo for a while and my jeep wanted to die everytime I came to a stop.  I fixed the VSS and it ran like a top.

I've checked the wiring diagrams and confirmed that the ECU does read the VSS input.
The VSS is used to help set the fuel curve.
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Mr_Random

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Re: 92 2.5 to a 80 CJ with a 2.5
« Reply #16 on: January 23, 2009, 04:53:12 PM »
Quote from: Jeffy on January 23, 2009, 10:52:37 AM
The VSS is used to help set the fuel curve.

yeah, I thought about it last night and that occurred to me. I was thinking along the lines of "load" curve, as in the same throttle position at two different speeds will require a different a/f mixture. Say you're going 65 and near WOT, but steady, you will be using much less fuel than when you are accelerating from a stop at near WOT.

I'm gonna go outside and compare the speedo adapter on the suburban to the jeep's, I have a hunch they are the same...
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Mr_Random

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Re: 92 2.5 to a 80 CJ with a 2.5
« Reply #17 on: January 23, 2009, 09:19:35 PM »
Sorry for the DP, but I have determined the speedo adapters and cables between my jeep and the suburban are at least similar, I don't have any conclusive evidence to say they are exactly the same, but I will it get by measuring thread pitch and the length of the cable that extends into the housing.

My personal speculation is that jeep used the GM adapter until 87... kinda makes sense in that they used the steering column, t-5 transmission, and pontiac iron duke (until 84/5ish?). My old style speedometer looks nearly identical to the suburban's one, in fact all the gauges are similar. Heck, the TBI system between the two is undeniably similar... Catch my drift maybe?

I'm looking to buy the pass-through pulse generator for GM adapters that was posted here, but first I'll make certain the $50 is properly spent.
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Offline Jeffy

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Re: 92 2.5 to a 80 CJ with a 2.5
« Reply #18 on: January 23, 2009, 09:40:40 PM »
What?  ???  Lets keep to one project here.  You have a question for your own project, ask in your own thread.  Lets not confuse the OP.
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Youtube Channel: https://www.youtube.com/channel/UCZNlr60GXH5OlKIFrT7P6mg
My Jeep: http://4bangerjp.com/forums/index.php?topic=2783.0
"If the motor car were invented today, there is absolutely no way that any government in the world would let normal members of the public drive one."

Mr_Random

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Re: 92 2.5 to a 80 CJ with a 2.5
« Reply #19 on: January 23, 2009, 11:08:01 PM »
oh crap! Ha... sorry... yeah I'm intruding I'll move on... sorry jeffy
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